Method of making enamel paints



Patented a. 19, 1937 2,096,095

UNITED STATES PATENT OFFICE METHOD OF MAKING ENAMEL PAINT George E. Finn, Cleveland, Ohio, assignor to The sherwin williams Company, Cleveland, Ohio, a corporation of Ohio No Drawing. Application March 2, 1934, Serial No. 713,775

1 Claim. (01. 134-51) This invention relates to a novel method of aging of varnish requires much capital and producing enamel paints of varying composition skilled operatives must be employed. Also, the and adapted for different uses. fire hazard is great and insurance ratesare high. H

In the various methods of making enamel In the making of enamel paints by my process 5 paints, that have been in commercial use, it has much" of this investment of' capital is. unneces- 5 been customary to mix the pigment materials sary and a large part of the expense is avoided. with suitable plasticizers to form a pasteand Varnish fires, varnish kettles, thinning rooms, then mix this paste with a suitable varnish, prefilter presses, and varnish storage tanks are not pared in a varnish plant, the required volatile needed. Only a few storage tanks are needed solvents or thinners being added to produce the for the storage of oils and thinners and rooms 10 enamel paint in condition to be used. or bins for the storage of pigments, resins and While enamel paints made by the processes drums containing solvents and plasticizers. now in use have been satisfactory as to quality, Some of the common resins of commerce such they have been relatively costly on account-0f as colophony, damar, elemi, gilsonite and ester the expense involved in the manufacture of the resins are soluble in linseed oil, spirits of turpen- 15 varnish. It is the object of my invention to pretine, petroleum spirit, coal tar hydrocarbons, etc. pare varnish or enamel paints, of the highest while the so-called fossil resins such as Kauri, quality, in a simple manner in which the final Congo, Manila, Zanzibar, etc., also the harder product is produced by introducing all of the asphalts, are not usually soluble in the mentioned components into a single apparatus in which solvents unless they have been pyrolyzed. How- .20 the process is carried out, thereby effecting great ever, these pyrolyzed resins are now readily obeconomies in the cost of manufacture. tainable as commercial products, and by their The apparatus whichI prefer to use is a mill .use it is possible to produce a wide range of of the rotating type in which dispersion is effectenamel paints.

ed by the action of falling balls, pebbles or rods The following examples of formulation illuscontained therein. Into this mill I pour or let trate the different types of enamel or varnish fiow a weighed quantity of selected oil or plastipaint which may be made by my process, but I cizer, also a weighed quantity of selected volaam not limited to these specific formulae nor tile solvent, a weighed quantity of the resin do I claim any specific formula. which is to be incorporated with the oil to make 30 the enamel vehicle, and a weighed quantity of Flat black baking enamel pigment. By varying the proportions of the in- Pounds gredients it is possible to prepare enamel paints Carbon bla 32 of widely varying properties. Diatomaceous earth.-- 30 35 The oils, resins and solvents used in my proces Colophony- 122 35 may consist of such materials as have long been Mineral spiri 18 used in the industry; yet my process can be used equally well with some of the newer syn- These are introduced into amill of the type dethetic resins along with suitable solvents and scribed and rotated for about 36 hours. 40 plasticizers. For the successful carrying on of Then add: 40 this process it is essential that knowledge should I be had as to compatibility or incompatibility of Heavy bodied linseed oil gals' 8 the ingredients to be employed and in each in- Heavy bodied tung oil gals 8 dividual batch only satisfactorily compatible in- Mineral spiri s Q21: 4 gredients should be used. Colophony cured with lime lbs 45 In the processes heretofore practised in the Kerosene als 35 making of enamel paints the varnish used has generally been a very expensive item. The var- Continue rotation for another. hour. nish may have been purchased from another 50 manufacturer or may have been made in an- Black frame enamel 50 other department of the paint manufacturer's plant. In either eventan installation for the Gilsonitelbs 3 manufacture of varnish has usually been ex- Colophony lbs 22 pensive. A plant with melting rooms, thinning Carbon black lbs 33 rooms, filter presses and storage tanks for the Mineral sp gals 33 These are introduced into a mill the type described and rotated for about 24 to 36 hours.

Then add:

Gallons Heavy bodied linseed oil 14 Heavy bodied tung oil 4 Mineral spirits I 36 Liquid drier" 3 Continue rotation for another hour.

Quick dryin primer surfacer Iron mririe bs-.. 444 Lithopone bs" 214 Whiting H bs 36 Zinc steal-ate bs 50 East India gum. lbs 50 Linseed oil "gals..- 13% Castor oil gals 1% Creosote oil gals- 32 These are introduced into a mill oi the type described and rotated for about 24 to 36 hours.

Then add:

' Gallons Mineral spirits 30 Liquid drier 4;

Continue rotation for another hour.

Trafiic zone white Titanium dioxide "lbs..- 104 Barytes ..lbs 326 East India. gum lbs 205 Tungoil; "gals" 8 Butylalcohol gals-.. 9 Methyl acetone "gals"; l8 Denatured alcohol gals 17% These are introduced into a mill or the type described and rotated for about 24 hours.

White enamel Pounds Titanium dioxide 93 Antimony trioxide 11 Vinyl resin 160 Dibutyl cellosolve phthalate 12 Tricresyl phosph a 38 Blown castor oil 1 Hexone 2'15 Toluol 275 Butyrone 67 Xyiol 68 These are introduced into a. mill oi the type described and rotated for about 24 to 36 hours.

White enamel Pounds Titanium dioxide 100 Zinc sulfide 100 Mowilith resi 48 Butyl acetate 70 Butyl' alcohol 10 Xylol 67 Dibutyl phthalate These are introduced into a mill of the type described-and rotated for about 24 to 36 hours.

If consistency is too thick for-some purposes, it may be reduced with xylol.

Having thus described my invention, I claim:

The hereindescribed method 01' making enamel paints which consists in aggregating the pigment material and resin components of the paint with suitable solvent and plasticizing materials to form a batch to be processed, then subjecting the batch to the grinding and mixing action of falling bodies in a rotating mill for. a suihcient time to produce a liquid in which the various components are uniformly dispersed, and thereafter combining and thoroughly mixing with said liquid suitable volatile solvents to complete the product and adapt it for use as an enamel paint.

GEORGE E. FINN. e 

